Inside Out Library
Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 169
index-armhas been moved so that the image of the Sun (©) appears to touch the horizon —- the index-arm reads the altitude of the Sun on the divided circle. The altitude of the Sun is also measured daily at apparent noon, thatis when the Sun is highest, by every navigator to obtain his latitude. In… … Fig. 92.—The Latitude of anObserver Determined byMeasuring the MeridianAltitude of the Sun. meridian. The altitude of the Sun HS is measured by the sextant.90° — HS = ZS, and ZS is thus a known arc. The declination of theSun at that instant is QS. It is a known quantity because it can betaken from…Astronomy
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